Frost dates for Montgomery L&d, PA
At Montgomery L&d, the median last spring frost (32°F) is Apr 28 and the median first fall frost is Oct 26, for a typical growing season of 178 days. For a 90% chance that the last frost has passed, wait until May 15. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 28Last spring frost (median)50% chance of 32°F after this date
- May 15Safer planting date10% chance of 32°F after this date
- Oct 26First fall frost (median)50% chance of 32°F by this date
- 178 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Apr 24 | May 9 | May 24 |
| 32°F | Apr 15 | Apr 28 | May 15 |
| 28°F | Apr 2 | Apr 17 | May 4 |
| 24°F | Mar 19 | Apr 3 | Apr 18 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Sep 28 | Oct 13 | Oct 26 |
| 32°F | Oct 9 | Oct 26 | Nov 6 |
| 28°F | Oct 22 | Nov 4 | Nov 19 |
| 24°F | Nov 1 | Nov 15 | Dec 1 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 134 days | 155 days | 175 days |
| 32°F | 156 days | 178 days | 197 days |
| 28°F | 179 days | 202 days | 223 days |
| 24°F | 204 days | 226 days | 248 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 15077 | 6b | -5 to 0°F | 4 km |
| 15052 | 6b | -5 to 0°F | 4 km |
| 15009 | 6b | -5 to 0°F | 6 km |
| 15061 | 6b | -5 to 0°F | 7 km |
| 15001 | 6b | -5 to 0°F | 8 km |
| 15050 | 6b | -5 to 0°F | 11 km |
| 15059 | 6b | -5 to 0°F | 11 km |
| 44441 | 6b | -5 to 0°F | 18 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00365902, at 40.6475, -80.3861, elevation 210 m (690 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 111.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Beaver Falls 1 NE (14 km)
- Glenwillard Dashields L&d (19 km)
- Moon Twp (19 km)
- Pittsburgh Intl Airport (23 km)
- Emsworth L/d Ohio River (30 km)
- New Castle 1 N (41 km)
- Butler 2 SW (45 km)
- Acmetonia Lock 3 (50 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.